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I forgot how to do this

I forgot how to do this-example-1

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Use the pythagorean theorem to find y.
a²+b²=c²
3²+4²=c²
9+16=c²
25=c²
c=5
y=5

All angles of a triangle form a sum of 180. We know there is 65 and 90 degree angles given to us.
65+90+x=180
155+x=180
x=25
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